PTFE high-temperature cloth hi PTFE coating leh fiberglass substrate hmanga siam a ni. Temperature sang zawka a awm chuan he thil hi hmun khatah 'melt' mai mai a ni lo – temperature range hrang hrang paliah physical leh chemical lama inthlak danglamna nasa tak a tawk thin.
260°C-a micro-cracking atanga 500°C+-a decomposition kimchang thlengin, structural changes hian PTFE coating a nghawng hmasa a, chutah chuan fiberglass substrate a nghawng leh a ni. Heng stage hrang hrangte hriatthiam hi him leh rintlak taka hnathawhna atan a pawimawh hle.
Aokai PTFE chuan PTFE-coated fabric-te thermal behavior chu temperature range zawng zawngah an zirchiang a. He kaihhruaina hian structural change stage pawimawh pali a sawifiah a, temperature limit hmantlak tak tak a pe bawk.
Hun rei tak chhunga Service Temperature Range – 260°C aia hniam
A structure pum pui chu a stable deuh a, slow, microscopic alterations erawh zawi zawiin a awm thung.
Hun rei tak chhunga thermal exposure hian polymer molecular chain te chu zawi zawiin a tichhuak a, crystallinity pawh a tisang tlem hle. Chutiang chuan coating chu a surface hardness a san chuan a brittle deuh a ni. Hei hi thil kalphung slow tak a ni – darkar za tam tak emaw, darkar sang tam tak emaw hnuah pawh teh theih a ni.
2. Interfacial thermal stress awmkhawmna
PTFE hian thermal-expansion coefficient chu roughly 10×10−5/°C a nei a, hei hi fiberglass aiin a sang zawk hle a, 5×10−6/°C vel a ni . Thermal-cold cycling nawn leh hian coating-substrate boundary-ah internal stress a siam a, a tawpah chuan hun kal zelah micro-crack a siam thin. Hei hi safe operating range chhunga aging mechanism bulpui ber a ni.
3. Residual additives te chu volatilization a ni
Surfactant leh wetting agents la awmte chu a chhe zauh zauh a, chu chuan puan chunglam chu a dum deuh vek a ni. Hei hi a tlangpuiin hlauhawm lo mahse thil chu a upa tawh tih a tilang.
Temperature Melting Point hnaih leh a aia sang – 327°C vel
PTFE hian a melting-point temperature a thlen chuan physical-structural transformation nasa tak a thleng thin.
1. Crystalline-region-a a hmin
Semi-crystalline opaque milky-white PTFE chu amorphous gel ang chi liquid ah a inthlak a, chu chu sharp volume expansion nen a inzawm a ni . Coating hian mechanical strength zawng zawng a hloh vek a, a nem a, a luang tan ta a ni. Hetih lai hian puan hian a dimensional stability leh structural integrity a hloh ta a ni.
2. Coating leh substrate inkara delamination
Cohesive force tlahniam leh thermal-expansion-induced stress hian molten PTFE chu a blister a, a peel off a, fiberglass fabric atanga a luang chhuak a, chu chuan composite delamination leh structural failure a thlen thin. Chuvang chuan non-stick surface chu a chhiat phah a ni. Vawikhat delamination a awm chuan a let leh thei lo.
3. Fiberglass hian a ruhro (skeleton structure) a vawng reng thin
Hetiang dinhmunah hian fiberglass fabric hi dimensionally stable takin a awm reng a ni. Protective PTFE layer tel lo chuan bare glass filaments te hi oxidation leh chemical erosion lakah an hlauhawm hle.
Aokai PTFE warning: 327°C aia sang excursion tawi te pawh hian delamination tihdanglam theih loh a thlen thin. Fabric hi a lum lai chuan a intact angin a lang thei a, mahse PTFE coating chu fiberglass atang hian a inthen reng a, mechanical integrity zawng zawng a hloh vek a ni.
Thermal Decomposition tan tirh – 400°C atanga 500°C thleng
PTFE molecular backbones hian chemical cleavage a tan a, chu chuan structural breakdown tihdanglam theih loh a thlen thin.
1. Depolymerization reaction thunun ber
Oxygen awm lohna hmunah chuan PTFE hian zipper-type degradation a tawk thin . Main chain-a CC covalent bonds te chu a chhe a, gaseous monomers a chhuak a, a bul berah chuan tetrafluoroethylene (95% aia tam) leh hexafluoropropylene te a awm a ni. Molecular weight chu nasa takin a tlahniam a, PTFE coating chu a pulverize a, a dissipate bawk.
Oxygen hian carbon free radicals a bei a, toxic gas carbonyl fluoride (COF2) leh trifluoromethane te a siam chhuak a, chu chu rimtui rimtui tak (sharp pungent sour odor) nen a inzawm a ni. Hydrogen fluoride (HF) leh perfluoroisobutylene (PFIB) te pawh hi thil engemaw takah chuan a chhuak thei bawk.
3. Carbon residue awm zat zawn chhuah
Pure PTFE hi carbon la awm lovin a vaporize vek tawh mai. Fabric-a black discoloration hi modified-grade PTFE-a fiberglass sizing agents, surface contaminants, emaw minor comonomers carbonization atanga lo chhuak a ni tlangpui.
4. Fiberglass sizing agents te halral
Fiberglass filaments-a khuh organic sizing agents te chu 350°C aia sangah an chhe vek thin. Glass filaments hian mutual adhesion a hloh a, chu chuan fabric chu a ti fluffy a, fuzzing a awm awlsam hle.
(配图4插入位置:本节末尾,展示PTFE在400°C以上分解后仅剩碳化残留物和裸露玻纤的照片
Caption: PTFE fabric 450°C-a a awm hnuah – coating chu a chhe vek a, carbonized residue chauh a awm a, exposed, fluffy fiberglass chauh a awm.
High-Temperature Destruction Zone – 500°C aia sang
PTFE coating chu a bo vek tawh a, bare fiberglass substrate chauhvin high-temperature load chhunzawm zel a phur ta a ni.
1. E-glass fiber tih nem
Standard E-glass fiber hian a softening point chu 840°C vel a ni . Chuti chung pawh chuan a tensile strength chu 500°C aia sangin a tlahniam nasa hle. 800°C aia lum a nih chuan fiberglass puan pum pui chu a nem a, a chhe a, a tlahniam a, structural support capacity a hloh bawk.
2. Temperature sang takah creep leh devitrification
Hun rei tak chhunga temperature sang taka awm hian glass fiber-te chu creep-stretching a thlen a, chu chu devitrification leh pulverization-in a zui a, chu chuan fabric structure chu a tichhia vek a ni. Hetiang dinhmunah hian puan chu textile anga hriat theih a ni tawh lo – glass fibers loose, fragile mass a lo ni ta a ni.
Thupui – Temperature Stage leh Critical Limits te
Temperature Range a ni
PTFE Coating hmanga siam a ni
Fiberglass hmanga siam a ni
Fabric Status zawng zawng
≤260°C a ni
Micro-cracking zawi zawiin a awm a, additive volatilization a awm bawk
Ngelnghet
✅ Functional – hun rei tak hman a him
260-327°C thleng a ni
Softening, stress pungkhawm
Ngelnghet
⚠️ Degradation a intan – hun rei lote chhung chauh
~327°C (a hmin) .
Melt, delaminate, structure a hloh
Ngelnghet
❌ Catastrophic – chhiatna tihdanglam theih loh
327-400°C thleng a ni
Molten, luang chhuak, coverage hloh
Stable (mahse venhim loh) .
❌ Hnathawh theih loh – coating inthen
400-500°C thleng a ni
A chhe a, gas tha lo (toxic gas) a chhuah tir thin
Sizing a kang chhuak vek
❌ Hlauhawm – meikhu rimchhia, structural loss
>500°C a ni
A bo vek tawh
>500°C ah a nem a, >840°C ah a hmin bawk
❌ Structural a hlawhchham vek
Aokai PTFE chuan delamination leh thermal decomposition avanga performance failure leh safety risk awm thei te pumpelh nan hun rei tak chhunga operating temperature 260°C hnuai lam kha khauh taka control a , hun rei lote chhunga peaks chu 300°C maximum thleng tihtlem a rawt a ni.
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